From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 93BF517996 for ; Mon, 23 Sep 2024 07:12:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727075554; cv=none; b=h3IkQ5s5XRlyHMhXac7geq5EUysjDQH15i6uhfcxV+SXCOdEVhMb64R7VWsdDmRScuLv4YioXuAwXuH4VszmqjA8pfBPKqBg2KEQNDNCVgSMmcCqDv5HST0zEQRRAFbk5FYzwy2BQzEPYZ9wCHQ/2AqMLCwgJ9uBXzwrXnVJgPo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727075554; c=relaxed/simple; bh=fkZNeFuPSOC4vkOBo7pLVMQrJchoOMHZAH9Io4Wvs6w=; h=From:In-Reply-To:References:To:Cc:Subject:MIME-Version: Content-Type:Date:Message-ID; b=MAXoF7vB9uYUQHmmfH3D+gdpaMW72PJp8843kctAKk9Z4gJMjMQYWqJNhZGlPTJVCyJ+uY8ShA4UyweqaQVUD52jnt3u2OgHTHs0C7qbaNBOYA6WlXbfgr1gdrpkxALt3Ej1Kh44fZmW8usWuYX0nigbBNbUFnxHhqu4f7FqE9Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=MiqfskaM; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MiqfskaM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727075551; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=fkZNeFuPSOC4vkOBo7pLVMQrJchoOMHZAH9Io4Wvs6w=; b=MiqfskaMQ20Z/TUjbx1NKeHsM5Mu0al+PTLlnarxf4gqxwJ7sZGIQs/RM3tBz33FJ6BAdM aoNNmLkj7UIpsOMIuUHLN7yHVoz0uEuqnKD+PtKI0/e4jRelfm+KIgXPujENyPTYJn6rOy 3Qxgoor67K6+YbeKRLTwGSD4YRhO7ak= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-180-mzblnrthND26R9sZBvRIqg-1; Mon, 23 Sep 2024 03:12:27 -0400 X-MC-Unique: mzblnrthND26R9sZBvRIqg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id AAA5C190DE27; Mon, 23 Sep 2024 07:12:26 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.145]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B7D693000235; Mon, 23 Sep 2024 07:12:24 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: To: Chang Yu Cc: dhowells@redhat.com, jlayton@kernel.org, netfs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org Subject: Re: [PATCH] netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <743843.1727075543.1@warthog.procyon.org.uk> Date: Mon, 23 Sep 2024 08:12:23 +0100 Message-ID: <743844.1727075543@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Chang Yu wrote: > Use kzalloc instead of kmalloc in netfs_buffer_append_folio to fix > a KMSAN uninit-value error in netfs_clear_buffer Btw, is this a theoretical error or are you actually seeing an uninitialised pointer being dereferenced? David